Both are high quality and very accurate firearms..
I do not have a Tikka , but I do have a CZ 550... In my opinion, it is a VERY good value..
I know a number of people who own CZ rifles, and nearly all of them are tackdrivers...
I love the single set trigger on the CZ...It is easily adjustable in both the single set or the standard mode...
I would be hard pressed to imagine a BETTER deer rifle than a CZ 550 in 6.5x55 ....